Define what a Surface-Piercing propeller is

Discussion in 'Propulsion' started by tom kane, Jul 12, 2009.

  1. powerabout
    Joined: Nov 2007
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    powerabout Senior Member

    Duo props are better than single props in just about every area
     
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  2. DogCavalry
    Joined: Sep 2019
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    DogCavalry Senior Member

    This thread is a gem! More than ten years since it was started, and the wisdom contained herein is still well in advance of current efforts.

    I'll just throw some sunshine the way of Albert Hickman, the pregenitor of it all.
     

  3. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    Hickmans sea sled.jpg
    A propeller operating in Surface piercing mode is propelling the boat as a water Jet would, without all the drag of a casing around it. Discharging a volume of water rearward from the boat. Unfortunately if a rudder is used (needs to be deep in water cancelling out shallow water use.) drag is increased. Using a Steerabe, Retractable shaft drive needs no rudder (reducing drag) and gives steering superior to a rudder. Supercavitating propellers were developed to usefulness for very fast military vessels by Vosper & Company. The pioneer of this technology and other high speed offshore boating technologies Albert Hickman (1877–1957), early in the 20th century. His Sea Sled designs used a surface piercing propeller. The longtail propulsion (Surface or Subsurface) was a French invention that spread through the french Colonies. Not an Asian Invewntion as some people assume.
     
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